package com.eazykitchen.interceptor;


import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;

import com.eazykitchen.entity.UserInformation;
import com.eazykitchen.service.UserService;
import com.eazykitchen.util.PassToken;
import com.eazykitchen.util.UserLoginToken;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * @title:AuthenticationInterceptor
 * @description: 认证请求头中的token的拦截器类
 * * @Author:Jabari
 * * @Date 2020/11/22 9:18
 * * @Version 1.0
 */

public class AuthenticationInterceptor extends HandlerInterceptorAdapter {
    @Autowired
    UserService userService;
    @Override
    public  boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object
                              )throws Exception {
        // 从 http 请求头中取出 token
        String token = httpServletRequest.getHeader("token");
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new RuntimeException("无token,请重新登录");
                }
                //获取token 中的user id
                int cId;
                try {
                    cId = Integer.parseInt(JWT.decode(token).getAudience().get(0));
                } catch (JWTDecodeException j) {
                    throw new RuntimeException("401");
                }
                UserInformation userInformation=userService.getUserByName("userName");
                if (userInformation == null) {
                    throw new RuntimeException("用户不存在，请重新登录");
                }
                // 验证 token
                JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(userInformation.getUserPwd())).build();
                try {
                    jwtVerifier.verify(token);
                } catch (JWTVerificationException e) {
                    throw new RuntimeException("401");
                }
                return true;
            } else {
                throw new RuntimeException("无认证方法访问");
            }

        }
        return true;
    }

}
